Safety mechanism



Dec. 8, 1925. 1,564,497

T. STENHOUSE ET AL SAFETY MECHANISM Filed Aug. 29, 1923 3 SheetsSheet 1 Dec. 8, 1925. 1,564,497

T. STENHOUSE El AL SAFETY MECHANISM Filed Aug. 1923 3 Sheets-Sheet 2 gmwmIo w Dec. 8, 1925. 1.564.497

T. STENHOUSE El AL SAFETY MECHANI SM Filed Aug. 29, 1923 3 Sheets-Sheet s attorney) Patented Dec. 8, 1925.

UNITED STATES PATENT OFFICE;

THOMAS STENHOUSE AN D DAVID STEIN HOUSE, OF WASHINGTON, PENNSYLVANIA, AS-

BIGNOBS TO HAZEL-ATLAS GLASS 00., OF WHEELIN G, WEST VIRGINIA, A CORPORA- TION OF WEST VIRGINIA.

SAFETY MECHANISM.

Application fllednuguat 29, 1923. Serial No. 660,057.

To all whom it may concern:

Be it known that we, THOMAS STENHOUSE and DAVID STENHOUSE, citizens of the United States, residing at Washington, in the county of Washington and State of Penn'- sylvania, have invented a new and useful Safety Mechanism, of which the following is a full, clear, and exact description.

Our invention relates to a safety mechanism to be used with a machine employing in its operation two different kinds of power, such as compressed air and electricity, and its object is to provide a, means whereby the electrical-control mechanism is rendered inoperative, and held in inoperative position Whenever, for any reason, the air supply is shut off.

In many types of glass pressing and blowing machines, for use with which this invention is more particularly designed, a series of molds mounted on a rotating table are moved successively to a station beneath a plunger which is projected into and withdrawn from each mold b compressed air, while that particular mol d remains at its station beneath the plunger. The step by step movement for successively moving the molds to the operating station is im arted to the carrier table by an electrically driven apparatus.

When for any reason the air supply fails,

or is shut off for repairs to the mac me'or pressure system, the plunger or other fluid controlled parts may move or be moved from their normal positions so as to destroy the synchronized movements of the machine and bring these parts into the aths of movement of the molds or other e ectrically-operated arts. If, under these conditions, the electrically-controlled means should be operated, or should continue to operate, breakage of parts would occur and the machine be entirely disorganized.

The present invention provides an interlocking control between the air and electrical systems whereby the electric controller is moved to inoperative position or held in inoperative position whenever, for any reason whatever, the air suppl is cut oil.

Thus it becomes impossible to operate the electrically-controlled art of the apparatus unless the entire meclianism is in proper working condition, and the possibility of breakage and disorganization of the parts is eliminated.

The objects and advantages of this invention will be more clearly understood from the accompanying drawings showing one embodiment of the invention, in which:

Figure l is a side elevation, partly in section, of 'aportion of a glass machine, showing our invention applied thereto.

Figure 2 is a fragmentary planview of a portion of the machine and all lines.

7 Figure 3 is an enlarged side elevation of a circuit breaker with the safety air cylinder shown in section.

Figures 4 and 5 are side and front elevations, res ectively, on a somewhat enlarged scale, of the switch box and safety air cylinder, and

Figure 6 is a section similar to Fig. 3 through the safety air cylinder, but showing the same in conjunction with a switch arm.

It may be here stated that the particular construction of the machine itself forms no part of the resent invention; therefore, in Figs. 1 and 2 of the drawings the main portions of the machine are indicated in relativel light lines, in order to more clearly istinguish the same from the safety attachment which is indicated by comparatively heavy lines.

Referring to the drawings more in detail, the numeral 1 indicates generally the less machine, which includes a rotatable ta le 2 on which are mounted a plurality of sets of molds 3. A step by step rotary motion, for moving the mo ds successively into operating position, is imparted to table 2 by a Geneva wheel 4, which is continuously rotated by an electric motor 5 in the electric circuit 6; and a typical variable speed switch box 7 provided with operating handle 8 is also placed in the circuit for controlling the motor.

In glass machines of the ressing and blowing type a plunger is rovided for producing the initial opening in the glass blank or parison. Such a plunger is indicated by reference numeral 9 in Fig. 1 and is operated by fluid pressure through the medium of the cylinder 10 and piston 11. This plunger is adapted to be projected into the molds 3 successively when the table is held stationary by means of the Geneva wheel 4.

15 which normally supplies fluid underpressure to the cylinder 16 which forms a substantial part of the safety mechanism. Slidably mounted in the cylinder 16 is a piston 17 carried on the piston rod 18, and this piston is normally forced in the direction of the switch arm 8 by means of compression spring 19 which surrounds one end of the iston rod and is confined between the piston 17 and the adjacent end of the cylinder 16. A plate 20 is secured to the outer end of the piston rod 18 for direct engagement with the switch arm 8. By referrin to Figs. 4 and 6 it will be seen that the fl uidpressure conduit 15 opens into the end of the cylinder 16 opposite to that in which the spring 19 is located, thereby providing means for moving the piston against the pressure of spring 19.

In the operation of the safety mechanism the piston 17 and likewise the rod 18 and plate 20 are maintained in the positions shown in Figs. 4 and 6 so long as the glass machine is working under normal conditions. Should the air suppl fail, or should the machine be shut down or any pur ose by closin the valve 14' the pressure wil be removed mm the left hand side of piston 17 (Fig. 6) and the spring 19 will move the iston over to the dotted line position, therey causi the plate 20 to engage the switch arm 8 an open the circuit to the motor 5. If now the operator desires to start up the machine he is prevented from doing so until the air is turned on. This is due to the fact that the plate 20 is held against the-switch arm 8 by means of the spring 19, and conseuently locks the same a ainst movement.

t should be here noted, however, that so long as the air ressure is on the machine the piston 1'? W1 1 be held retracted and the switch arm 8 will be free for movement to either open or closed position.

In Fig. 3 we have shown a somewhat modified arrangement of the safety mecha nism in which the cylinder 30 is attached to a circuit-breaker casing 31. In this instance the piston rod 32 carries a roller 33 ada ted for co-operation with a lever 34 whic is pivotally mounted on the circuit-breaker casing, as indicated at 35. This form of the invention is otherwise identical with that lowered into a mold or between two molds. With the present arrangement of safety so mechanism, however, such abnormal positions of theair-o erated parts are avoided. and consequently it will be apparent that all danger of such accidents and wrecking of the arts is completely eliminated.

aving fully described our invention, what we claim as new and desire to secure by Letters Patent is:

1. The combination with a machine comprising parts operated from one source of power, other parts co-operating therewith and operated from another source of power,

iii)

of means rendering inoperative the firstmentioned source of power by the shutting off of the second-mentioned source of power. 9:,

2. The combination with a machine operated partly by fluid pressure and partly by electricity, of means to prevent closing of the electric circuit while the fluid pressure is turned off.

3'. The combination with a machine operated partly by fluid pressure and partly by electricity, of automatic means for open- 'ing the electric circuit when the fluid pressure is turned off.

4. The combination with a machine operated partly by electricity and partly by fluid pressure, of means rendering the electric operation inoperative by shutting off the find pressure.

5. The combination with a machine operated partly by fluid pressure and partly by electricity, a switch normally operable to control the electric circuit, and means for automatically locking said switch in open pg sition when the fluid pressure is turned 0 6. The combination with a machine comprising a movable table, a plurality of molds carried thereby a source of power for operating said table, a lunger adapted to successively enter sai molds, and means for operating said lunger, of means for renderin inoperative said source of power by the. s utting off of the plunger-operating means.

7. The combination with a machine comprising a rotatable table, a plurality of molds carried thereby, a source of ower for operating said table, a plunger 0. apted to successively enter said molds, and means for operating said plunger, of means for rendering inoperative said source of power by the shutting off of the plunger-operatmeans.

8. The combination with a machine having an electrically-operated table, a plurality of molds thereon, a fluid-operated plunger adapted to successively enter said molds, of means for preventing the closing of the electric circuit while the fluid pressure is shut ofl'.

9. The combination with a machine ineluding a rotatable table, molds mounted thereon, :1 Geneva wheel geared to said table, an electric motor for operating said Genera wheel, a fluid-operated plunger ada ted to successively enter said molds, an automatic means for o ening the circuit to said motor when the uid pressure is shut ofi, said means being adapted to prevent the closing of said circuit until the fluid pressure is turned on.

10. The combination with a machine operated partly by fluid pressure and partly by electricity, of means for automatically opening the electric circuit when the fluid pressure is shut off, said'means including a c kinder and piston, a spring engaging one side of the piston, and a fluid pressure conduit leading to the opposite side of the piston,

11. In combination with a machine operated partly by fluid ressure and partly by electrlcity, a switch or controlling the elec trio circuit, a cylinder mounted adjacent said switch, a piston and piston rod in said cylinder, :1 spring engaging one side of said piston, and a fluid pressure conduit leading to the other side of said piston, whereby the piston rod will engage and open said switch when the fluid pressure is turned OR.

12. The combination with a machine having a rotatable table, an electric motor for operating said table, a plurality of pressure-operated elements co-operating with said table, a main fluid pressure line, a

branch line leading to said machine, a plu- 1 rality of conduits leading from the branch 1 line to the various fluid-operated elements, a shut-ofl' valve in the branch line, an additional fluid-pressure conduit leading from said branch line just beyond the valve, and

means connected with said additional fluidpressure conduit for reventing operation of said table when t e fluid pressure is turned ofl'.

THOMAS STENHOUSE. DAVID STENHOUSE.

to successively enter said molds, and means for operating said plunger, of means for rendering inoperative said source of power by the shutting off of the plunger-operating means.

8. The combination with a machine having an electrically-operated table, a plurality of molds thereon, a fluid-operated plunger adapted to successively enter said molds, of means for preventing the closing of the electric circuit while the fluid pressure is shut off.

9. The combination with a machine including a rotatable table, molds mounted thereon, :1 Geneva wheel geared to said table, an electric motor for operating said Geneva wheel, a fluid-operated plunger adapted to successively enter said molds, and automatic means for opening the circuit to said motor when the fluid pressure is shut otf, said means being adapted to prevent the closing of said circuit until the fluid pressure is turned on.

10. The combination with a machine operated partly by fluid pressure and partly by electricity, of means for automatically opening the electric circuit when the fluid duit leading to the opposite side of the piston.

11. In combination with a machine operated partly by fluid ressure and partly by electricity, a switch fiir controlling the electric circuit, a cylinder mounted adjacent said switch, a piston and piston rod in said cylinder, :1 spring engaging one side of said piston, and a fluid pressure conduit leading to the other side of said piston, whereby the piston rod will engage and open said switch when the fluid pressure is turned E.

12. The combination with a machine having a rotatable table, an electric motor for operating said table, a plurality of pressure-operated elements cooperating with said table, a main fluid pressure line, a branch line leading to said machine, a plurality of conduits leading from the branch line to the various fluid-operated elements, a shut-off valve in the branch line, an additional fluid-pressure conduit leading from said branch line just beyond the valve, and

means connected with said additional fluid- 4 pressure conduit for reventing operation of said table when tli e fluid pressure is pressure is shut off, said means including a turned off.

cylinder and piston, a spring engaging one THOMAS STENHQUSE.

side of the piston, and a fluid pressure con DAVID STENHOUSE.

DISOLAI MER- 1,564,497.Thomas Stenhouse and David Patent dated December ECHANISIH Stenhouce, Washington, Pa. Sum! 8, 1925. Disclaimer filed January 10,

1927, by the assignee, Hazel-Atlas Glass Uompany.

Hereby enters this disclaimer. Clami 1. Your petitioner disclaims any interpretation to the words rendering inoperative the first mentioned source of power other than to render inoperative a prime mover, as exemplltled by prime mover 50f patentees drawing.

Claims 6 and 7. Your petitioner rendering inoperative said source of prime mover, as exemplified [Oficz'al Gazette Fe ruwry 1, 1.927.]

disclaims any interpretation to the words power other than to render inoperative a by prime mover of patentees drawing.

DISCLAIMER.

1,564,497.Th0ma8 Stenlwuse and David Stenhouee, Washington, Pa. Sm MECHANISM. Patent dated December 8, 1925. Disclaimer filed January 10, 1927 by the assignee, Hazel-Atlas Glass Company.

Hereby enters this disclaimer.

Claim 1. Your petitioner disclaims any interpretation to the words rendering inoperative the first mentioned source of power other than to render inoperative a prime mover, as exemplified by prime mover 50f patentees drawing.

Claims 6 and 7. Your petitioner disclaims any interpretation to the words rendering inoperative said source of powerother than to render inoperative a prime mover, as exem lified by prime mover 5 of patentees drawing.

[Ofiicial Gazette Fe man-y 1, 1927.] 

